[Userscript] Microsoft Remote Desktop Web Access for all

msrdwa-for-all.user.js

// ==UserScript==
// @name		Microsoft Remote Desktop Web Access for all
// @namespace		memmie.lenglet.name
// @author		mems <memmie@lenglet.name>
// @homepageURL 	https://gist.github.com/mems/e7277c1118e1d876dd7333bb8c2bb49b
// @description		Allow to use RD Web Access on browser that don't support RD ActiveX
// @match		*://*/RDWeb/Pages/*
// @updateURL   	https://gist.github.com/mems/e7277c1118e1d876dd7333bb8c2bb49b/raw/msrdwa-for-all.user.js
// @version		1.0.0
// ==/UserScript==

// Fix CSS included by JS
CSSStyleSheet.prototype.addRule === undefined && Array.from(document.scripts).forEach(s => {let r = /document\.styleSheets\[\d+\]\.addRule\('((?:\\'|[^'])+)',\s'((?:\\'|[^'])+)'/g; for(let m; (m = r.exec(s.text)) !== null;) document.styleSheets[0].insertRule(m[1]+"{"+m[2])+"}"});
// Show the appboard and public mode checkbox
Array.from(document.querySelectorAll(".tswa_appboard, .tswa_PublicCheckboxLess")).forEach(el => el.style.display = !el.classList.contains("tswa_appboard") || el.id.endsWith("AppDisplay") ? "block" : "none");
// Inject RDP object proxy (available only in IE with RD ActiveX)
const script = document.createElement('script');
script.appendChild(document.createTextNode(`
window.MsRdpClientShell = window.MsRdpClientShell || {
	PublicMode: true,
	RdpFileContents: "",
	Launch(){
		const settings = this.RdpFileContents.split("\\r\\n").reduce((settings, line) => {
			if(line.trim()){
				const [type, ...value] = line.split(":");
				settings.set(type, value.join(":"));
			}
			return settings;
		}, new Map());
		settings.set("public mode", this.PublicMode ? "i:1" : "i:0");
		
		const a = document.createElement("a");
				
		const raw = Array.from(settings).map(([key, value]) => key + ":" + value).join("\\r\\n");
		const url = a.href = URL.createObjectURL(new Blob([raw], {type: "application/x-rdp"}));
		
		const appname = (settings.get("remoteapplicationprogram") || "").startsWith("s:||") ? settings.get("remoteapplicationprogram").substr(4) : (settings.get("remoteapplicationname") || "s:remoteapp").substr(2);
		const wksp = (settings.get("Workspace Id") || "s:").substr(2);
		const title = [appname, wksp].filter(v => v).join(" - ");
		
		a.download = title.replace(/[\\\\\\/:\\*\\?"<>\\|]/g, "-") + ".rdp";// valid Windows filename
		
		document.body.appendChild(a);
		a.click();
		
		a.remove();
		this.releaseURL(url);// no retains
	},
	releaseURL(url){
		setTimeout(() => URL.revokeObjectURL(url), 10000);// just in case
	}
}
`));
document.head.appendChild(script);

• IMsRdpClientShell interface (Windows)
• Supported Remote Desktop RDP file settings | Microsoft Docs
• Remote Desktop Connection .rdp File Keywords (Compact 7)
• Overview of .rdp file settings - DONKZ.NL | Remote Desktop Plus
• mstsc /v:12.34.45.789 /public public mode, passwords and bitmaps are not cached %WINDIR%\system32\mstsc.exe
• About Digitally Signing RemoteApp Programs
• terminal services - Is there a way to change command-line arguments in a signed RDP file? - Stack Overflow
• Create an .rdp File
• Can RDP clients launch remote applications and not desktops - Stack Overflow